Applying boundary conditions on holes
 

Boundary conditions are applied on named selections in ANSYS CFX as stated in the tutorials.
But do we always need a surface for this named selection?
Let say I have an inlet pipe, so do I have to make a surface to close the end of the pipe, ( that surface will be used for named selection)?
Or the pipe too is a solid rather than tube?

Well for your pipe, if you want to simulate the flow inside then you need a volume mesh, so you will be able to select the inlet and outlet surface of your pipe, so your pipe will be “closed” with a surface that you will be able to select.

The name selection is not a mandatory procedure, but it’s easier once you need to setup your boundary conditions in CFX. You can still, within CFX create BC, but if you model more complex geometries with several inlets/outlets you will gain time by creating named selections before.

Thank you for the help. I really was confused about this thing.